# Unnecessary transcoding to Chromecast **URL:** \ **Category:** Apps & Creations\ **Tags:** other-third-party\ **Created:** [January 11, 2014, 3:17pm UTC](https://forums.plex.tv/t/unnecessary-transcoding-to-chromecast/53694 "2014-01-11T15:17:13Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![tr0nix1982](https://avatars.discourse-cdn.com/v4/letter/t/cc9497/32.png) [@tr0nix1982](https://forums.plex.tv/u/tr0nix1982)\ **Post date:** [January 11, 2014, 3:17pm UTC](https://forums.plex.tv/t/unnecessary-transcoding-to-chromecast/53694/1 "2014-01-11T15:17:13Z")
Hi there   Because my Synology NAS is transcoding too slowly, I did a reencoding of an mkv based to target format that is specified on the Chromecast codec reference: [https://developers.google.com/cast/supported\_media\_types](https://developers.google.com/cast/supported_media_types)   Version of Media Server is 0.9.8.6   Input: MKV with: Stream #0.0: Video: h264 (High), yuv420p, 1280x720, PAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default) Stream #0.1(ger): Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s (default)   So I did several tries in reencoding / remuxing the container and audio channel (I even tried MP3 encoding which is no option for me as it is only stereo): /volume1/@appstore/MediaServer/bin/ffmpeg -i itn-dexter.s01e01.720p.mkv.back -vcodec copy -b:a 1600k -acodec libfaac -ac 6 dex.mp4 /volume1/@appstore/MediaServer/bin/ffmpeg -i itn-dexter.s01e01.720p.mkv.back -vcodec copy -b:a 1600k -acodec libfaac -profile:a aac\_low -ac 6 dex.mp4   So at least the second remuxing to AAC with LC-AAC should fit. ffmpeg tells me now: Stream #0.0(und): Video: h264 (High), yuv420p, 1280x720, 3753 kb/s, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc Stream #0.1(ger): Audio: aac, 48000 Hz, 5.1, s16, 197 kb/s   I renamed the file and reloaded the media library. Plex now shown me the correct information (sorry for german output, but I think you're quiet familiar with the shown information):   ``` Medien ``` Video Auflösung 720p Dauer 53:01 Bitrate 3957 kbps Width 1280 Height 720 Seitenverhältnis 1.78 Container MP4 Video Bildfrequenz 24p Optimized For Streaming No ``` Datei ``` Accessible Yes Exists Yes Dauer 53:01 Datei /volume1/Plex/Media/Serien/Dexter/S01/itn-dexter.s01e01.720p/itn-dexter.s01e01.mp4 Size 1.47 GB Container MP4 Has 64bit Offsets 0 Optimized For Streaming No ``` Video ``` Codec H264 Bitrate 3755 kbps Bit Depth 8 CABAC 1 Chroma Subsampling 4:2:0 Color Space yuv Dauer 53:01 Bildrate 23.976 fps Frame Rate Mode vfr Has Scaling Matrix 0 Height 720 Ebene 4.1 Profil high Ref Frames 5 Scan Type progressive Width 1280 ``` Audio ``` Codec AAC Kanäle 5.1 Bitrate 198 kbps Sprache Deutsch Bitratenmodus VBR Dauer 53:01 Profil lc Abtastfrequenz 48000 Hz ``` ```   So I thought hooray, this should go trough, however the playback struggled all the time and my Synology NAS shown me 100% CPU usage with the new transcoder process running crazy (media indexing is NOT enabled).   The logs show me, that the media is getting transcoded: ``` Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Using profile Chromecast Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Downloading document http://127.0.0.1:32400/library/metadata/20 Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - HTTP requesting to: http://127.0.0.1:32400/library/metadata/20 Jan 11, 2014 16:00:31 [0xb2856b70] DEBUG - Request: GET /library/metadata/20 [127.0.0.1:55598] (4 live) Jan 11, 2014 16:00:31 [0xb2856b70] DEBUG - It took 0.000000 sec to serialize a list with 1 elements. Jan 11, 2014 16:00:31 [0xb192fb70] INFO - Dexter - Dexter (S01E01): unable to obtain value for video.heigh Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Remuxing to dash/mp4/h264/aac Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Found session GUID of in session start. Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Cleaning directory for session 4d062074-8ae5-4028-a1b8-ec603b13d501 (/volume1/Plex/tmp_transcoding/plex-transcode-4d062074-8ae5-4028-a1b8-ec603b13d501-027017d3-6561-4375-8c84-a615e06340a6) Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Starting a transcode session 4d062074-8ae5-4028-a1b8-ec603b13d501 at offset -1.0 (stopped=1) Jan 11, 2014 16:00:31 [0xb192fb70] DEBUG - Job running: /volume1/@appstore/Plex Media Server/Resources/Plex New Transcoder -i http://127.0.0.1:32400/library/parts/115/file.mp4 -threads 0 -y -f dash -loglevel quiet -loglevel_plex error -map_metadata -1 -progressurl http://127.0.0.1:32400/video/:/transcode/session/4d062074-8ae5-4028-a1b8-ec603b13d501/progress -vcodec libx264 -crf 22 -maxrate 8000k -bufsize 16000k -vsi 0x0 -preset veryfast -x264opts cabac=0:me=dia:subme=0:me_range=4:no_chroma_me:8x8dct=0:bframes=0:rc_lookahead=1:qcomp=0.50:qpmin=10:qpmax=51:qpstep=4:partitions=none -min_segment_duration 3 -initial_segment 0 -force_key_frames expr:gte(t,n_forced*3) -map 0:0 -sn -acodec copy -map 0:1 dash Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - Request: GET /library/parts/115/file.mp4 [127.0.0.1:55599] (4 live) Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - Content-Length of /volume1/Plex/Media/Serien/Dexter/S01/itn-dexter.s01e01.720p/itn-dexter.s01e01.mp4 is 1573560188. Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - Request: GET /library/parts/115/file.mp4 [127.0.0.1:55600] (5 live) Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - Request range: 1571020993 to 0 Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - Content-Length of /volume1/Plex/Media/Serien/Dexter/S01/itn-dexter.s01e01.720p/itn-dexter.s01e01.mp4 is 1573560188. Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - Request: GET /library/parts/115/file.mp4 [127.0.0.1:55601] (4 live) Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - Request range: 48 to 0 Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - Content-Length of /volume1/Plex/Media/Serien/Dexter/S01/itn-dexter.s01e01.720p/itn-dexter.s01e01.mp4 is 1573560188. Jan 11, 2014 16:00:32 [0xb2856b70] INFO - [Transcoder] Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://127.0.0.1:32400/library/parts/115/file.mp4': Jan 11, 2014 16:00:32 [0xb2e32b70] INFO - [Transcoder] Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 3753 kb/s, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc Jan 11, 2014 16:00:32 [0xb2856b70] INFO - [Transcoder] Stream #0:1(ger): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 197 kb/s Jan 11, 2014 16:00:32 [0xb2e32b70] DEBUG - [Transcoder] Average FPS ~ 24 fps, Frame rate ~ 24 fps. Jan 11, 2014 16:00:32 [0xb192fb70] DEBUG - [FFMPEG] Duration: 3181 Jan 11, 2014 16:00:32 [0xb192fb70] DEBUG - Read line, and done: 1 Jan 11, 2014 16:00:32 [0xb192fb70] DEBUG - Started session successfully: 4d062074-8ae5-4028-a1b8-ec603b13d501 Jan 11, 2014 16:00:32 [0xb2856b70] INFO - [Transcoder] Output #0, dash, to 'dash': Jan 11, 2014 16:00:32 [0xb2e32b70] INFO - [Transcoder] Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 24k tbn, 23.98 tbc Jan 11, 2014 16:00:32 [0xb192fb70] INFO - [Transcoder] Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, 5.1, 197 kb/s Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - Request: PUT /video/:/transcode/session/4d062074-8ae5-4028-a1b8-ec603b13d501/progress?width=1280&height=720 [127.0.0.1:55609] (5 live) Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - * width => 1280 Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - * height => 720 Jan 11, 2014 16:00:32 [0xb2856b70] DEBUG - DASH segment range: -1 - -1 ``` So my question is - what am I doing wrong? I think I have the correct container (MP4), the correct video (H264) and audio (AAC, LC-AAC) encodings. This should go trough without any transcoding?   Any help is very appreciated, Joel ---
**Author:** ![blatantsubtext](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/blatantsubtext/32/2738_2.png) [@blatantsubtext](https://forums.plex.tv/u/blatantsubtext)\ **Post date:** [January 12, 2014, 12:24am UTC](https://forums.plex.tv/t/unnecessary-transcoding-to-chromecast/53694/2 "2014-01-12T00:24:27Z")
What client are you casting from? You should check your client's bitrate settings for local playback. I had to change my Android settings to "Maximum" for Over Local Network before casting to the Chromecast didn't transcode. ---
**Author:** ![tr0nix1982](https://avatars.discourse-cdn.com/v4/letter/t/cc9497/32.png) [@tr0nix1982](https://forums.plex.tv/u/tr0nix1982)\ **Post date:** [January 12, 2014, 10:06am UTC](https://forums.plex.tv/t/unnecessary-transcoding-to-chromecast/53694/3 "2014-01-12T10:06:30Z")
Hi Blatan Thanks for your answer. The client was on iOS (iPhone). I just did a repackaging of the newest Plex Media Server for my DS214play and now it works like a charm. I think the profile wasn't set up properly and is fixed with the newest release (didn't find anything in the changelog so far). Regards Joel ---
**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\ **Post date:** [December 21, 2019, 1:00am UTC](https://forums.plex.tv/t/unnecessary-transcoding-to-chromecast/53694/4 "2019-12-21T01:00:13Z")
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